Chronic Inflammatory Demyelinating Polyneuropathy (CIDP) is a rare neurological disorder that targets the bodys nerves. It is an autoimmune disorder in which the body attacks the myelin sheaths, the fatty coverings on the fibers that insulate and protect the nerves. CIDP can cause progressive weakness and reduced senses in the arms and legs, tingling or no feeling in fingers and toes, loss of deep tendon reflexes, fatigue, and unusual feelings in the body. Symptoms arent the same for everyone, but you may be tired and have areas of numbness and pain. It can slow your reflexes and make your arms and legs feel weak. CIDP can happen at any age and in both genders but is more common in young adult men. CIDP is closely related to Guillain-Barré syndrome (GBS) and is considered the long-term part of that disease. CIDP is usually classified as progressive, recurrent, or monophasic. The exact cause of CIDP is unknown, but there are strong indications that CIDP is an autoimmune disorder. Treatment for CIDP includes the use of steroid medicine and other treatments that focus on the immune system, along with physical therapy.